Safety guard for presses and the like



' April 1940- E. A. DESCHENES SAFETY GUARD FOR PRESSES AND THE LIKEFiled Feb. 28. 1939- Patented Apr. 9, 1940 2,196,195 r v SAFETY GUARD Fo' a PRESSES AND THE; KE 7 Emile A. Deschenes, Salem, Mass., assignor toUnited-Shoe Machinery Corporation, Boroughof, Flemington, N. J.,a'corporation of New Jersey Application February 28, 1939, Serial No.258,985

5 Claims.

This invention relates tosafety guards for presses" and similar machinesand is herein illustrated,"by way of example but noto'f limitation,

as 'embodied in a heel compressing machine of the 5 type disclosed inLetters Patent of the United Stats No. 776,823, issued December 6,1904,01'1 theapplication of CharlesLlAllen'.

: InjtheQoperation of machines of this type, it

h occasionally occurs that the work not properly 10p1aced when presentedto the presser members.

In'an "effort to prevent the'work from being damaged,- the operatorsometimes attempts to straighten it after the machine has started. At

. ;,.sucffa time, the'operator' runs a serious risk of 1B"having hishand caught between the operating partsof the machine and beingseriously injured. With a view to'preventin'g such injuries, deviceshavebeen suggested which require the use of the operators hands as wellas his foot to start the gomachine. Such devices, however'are'unsatisfactor'y' because they furnish no protection after the machinehas been set in motion. It has also been suggested that stationary guardfences beprovided'between the operator and the working parts 21y of'themachine. However, such devices have the disadvantage that in ordertohave access to such parts, it is necessary to arrange the guard fenceso, that it may be opened, and the operator will frequently leave theguard fencein open position. go' Furthermore on many'types of presses,it is impossible to find a place for a stationary guard fence of thistype in a position where it will prop- I erly protect the operator andat thesame time not interfere with the action of the moving parts of 35-the machine. h

It is therefore'an object of thepresent invention to provide 'a guard'fence'which will prevent the operator from putting his hands into thedangerzonebetween thepressure applying parts 6 f thehfachin'ebfitwillnot interfere with the operation of the machine. It is a-furtherobject of the invention to provide means connected to the guard fencewhich will prevent starting of the machine when the guard fence is openand will 45 prevent opening of the guard fence when the machine isrunning.

Accordingly, the invention comprises a safety device for presses and thelike comprising a starting treadle, a reciprocating presser member, a

50 reciprocating guard fence mounted on the presser member by meanspermitting horizontal swinging movement of the guard fenceand meansactuated by the horizontal movement of the guard fence for locking thetreadle in inoperative position, the

a locking means being constructed and arranged to (Cl. 192-434)v preventopening of the guard fence when the treadle is depressed.

j The invention will be further described with reference to theaccompanying drawing, in which Fig. 1 is a front elevationof a heelcompressing machine with the safety guard attached thereto;

Fig. 2 is a side elevationof the guard fence and reciprocatingcrosshead; and Fig. 3 is a view on a larger scale of the guard fencesupport, portions being broken away to show the keyway andthearrangement of the detent pm. V I

The invention is illustrated as embodied in a heel compressing machinecomprising a frame it carrying a vertically reciprocable crosshead l2. Av toggle M has its lower end pivoted on the frame it at IS, the upperend being pivoted to the crosshead I2. One end of 'a connecting rod I8is connected to the center joint of the toggle. The other end of theconnecting rod I8 is connected to 20 a crank provided with a flywheeladapted to be driven through a clutch (not shown) by a belt or anelectric motor. In operation, the flywheel acts, through the crankandtoggle, to reciprocate the crosshead and compress the heels as theyare insert ed in the machine. A treadle 22 fixed on a shaft 23 isconnectedby the shaft to the clutch. The upper portion of the frame I0is adapted to carry an upper mold 24, the lower mold (not shown) beingcarried, by, the crosshead l2. A feeding and ejecting mechanism 26projecting for.- wardly from the crosshead i2 is provided to present theheels to the molds and to eject them from the machine after compression.

The guard fence 28 isan elongated wire frame extending from one side ofthe machine across the front thereof above the feeding mechanism 26 andcovering substantially all of the open space between the molds. Theguard 28 is adjustably fastened by screws 30 to a support 32 and may beraised or lowered soas to give just suificient clearance for a heelblank to be carried by the feeding mechanism ZB beneath the guard to themolds; The support 32 is bolted to an arm 34 held between the ends ofa'forked bracket 36 which is fastened to the reciprocating crosshead. Arod 38 extending through the bifurcated end of the forked bracket 36 andthe end of the arm 34 held therein is held against rotation relative tosaid arm by a keyway 40in the rod and a key 42 in the arm. The bracket36 and the arm 34 may, however, move up and down-on the rod 38. The arm34 carries a detent pin 44, the end of which is releasably held by aspring 46 in an aperture 48 in the forked bracket 36 and normally keepsthe guard fence in its closed position.

The lower portion of the rod 38 is journaled in an arm of a bracket 52bolted to the frame ID of the machine, the rod being held againstvertical movement by collars 53 on either side of the arm 50. The lowerend of the rod 38 is bent substantially at right angles to form a hook54 the end of which is approximately parallel with the guard fence 28.The rod 38 is located sufliciently near the treadle 22 so that when theguard fence is opened, the hook' 54 is. swung under the treadle, thuspreventing depression of the latter.

The treadle is held in its upmost position by a spring 56 and, while theguard 28 is in its closed position, may be depressed and releasedfreely. When the treadle is in upmost position, however, the detent pin44 may be pulled out and the guard fence 28 swung into open position.The key 42 and the keyway 40 compel the rod to rotate with the guardfence and the hook 54 is thus turned under the treadle 22, preventingdepression of the latter.

If an attempt should be made to swing the guard fence to open positionwhile the machine is operating and the treadle is in its down position,only a slight movement may occur before the end of the hook 54 strikesagainst a boss 58 on the side of the treadle 22 and prevents furtheropening.

When the machine is running, the forked bracket 36 which is bolted tothe crosshead l2 moves upwardly as the crosshead rises to compress aheel, and carries the arm 34 and the guard with it. The guard is thusalways maintained in the same position relative to the crosshead andfeeding mechanism and does not interfere with the operation of themachine.

At the same time, however, when the machine is running, the guard 28always remains in position between the operators hands and thoseportions of the machine most apt to cause him injury. The operator isthus completely protected against accidental movements of his hands intothe danger zone between the compressing molds. Likewise, when themachine is at rest the guard may readily be swung aside to give accessto the space within the machine for the purpose of changing molds and itwill be impossible for the machine to be started until the operator hasremoved his hands from the danger zone and closed the guard.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. A safety device for presses and the like comprising a startingtreadle, a reciprocating presser member, a reciprocating guard fencemounted on said presser member by means permitting horizontal swingingmovement of said guard fence, and means actuated by the horizontalmovement of said guard fence for locking said treadle in inoperativeposition, said locking means being constructed and arranged to preventopening of the guard fence when the treadle is depressed.

2. A safety device for presses and the like comprising a startingtreadle, a reciprocating presser member, a rod, a guard fence slidablymounted on said rod by means permitting horizontal swinging movement ofsaid guard fence with said rod, means for reciprocating said guard fencewith said presser member, and means operated by said rod for lockingsaid treadle in inoperative position, said locking means beingconstructed and arranged to prevent opening of the guard fence when thetreadle is depressed.

3. A safety device for presses and the like comprising a startingtreadle, a reciprocating presser member, a rotatable rod, a guard fenceslidably mounted on said rod, means for preventing relative rotation ofthe guard fence and the rod, means for reciprocating said guard fencewith said presser member, and means operated by horizontal movement ofsaid guard fence for locking said treadle in inoperative position, saidlocking means being constructed and arranged to prevent opening of theguard fence when the treadle is depressed.

4. A safety device for presses and the like comprising a startingtreadle, a reciprocating presser member, a rod, a guard fence slidablymounted on said rod by means permitting horizontal swinging movement ofsaid guard fence with said rod, means for reciprocating said guard fencewith said presser member, a hook at the lower end of said rodconstructed and arranged to be swung under the treadle by the horizontalmovement of said guard fence to prevent depression of said treadle, anda boss on the side of said treadle constructed and arranged to engagesaid hook and to prevent the guard fence from being opened when thetreadle is depressed.

5. A safety device for presses and the like comprising a startingtreadle, a reciprocating presser member, a rotatable rod, a guard fenceslidably mounted on said rod, means for preventing relative rotation ofthe guard fence and the rod, means for reciprocating said guard fencewith said presser member, a hook at the lower end of said rodconstructed and arranged to be swung under the treadle by horizontalmovement of said guard fence to prevent depression of said treadle. anda boss on the side of said treadle constructed and arranged to engagesaid hook and to prevent the guard fence from being opened when thetreadle is depressed.

EMILE A. DESCHENES.

